Knee pad



FIG. 1 is a front view of a knee pad, showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a front view thereof, shown in a relax condition; and,

FIG. 4 is a perspective thereof, showing an in-use condition.

The broken lines illustrate unclaimed features of the knee pad and form no part of the claimed design. 

CLAIM The ornamental design for a knee pad, as shown and described. 